View Compilation Error

0_0_30237195_22525.cpp: In function 'void addedge(int, int)':
0_0_30237195_22525.cpp:25:10: error: 'cntroad' was not declared in this scope
     road[cntroad] = {v,head[u]}; head[u] = cntroad++;
          ^
0_0_30237195_22525.cpp:25:24: error: 'head' was not declared in this scope
     road[cntroad] = {v,head[u]}; head[u] = cntroad++;
                        ^